Engineering Heat Transport Across Epitaxial Lattice-Mismatched van der Waals Heterointerfaces
Chávez Ángel, Emigdio (Institut Català de Nanociència i Nanotecnologia)
Tsipas, Polychronis (National Center for Scientific Research "Demokritos")
Xiao, Peng (Institut Català de Nanociència i Nanotecnologia)
Ahmadi, Mohammad Taghi (University of Warwick)
Daaoub, Abdalghani H. S. (University of Warwick)
Sadeghi, Hatef (University of Warwick)
Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)
Dimoulas, Athanasios (National Center for Scientific Research "Demokritos")
Sachat, Alexandros el (Institut Català de Nanociència i Nanotecnologia)

Date:	2023
Abstract:	Artificially engineered 2D materials offer unique physical properties for thermal management, surpassing naturally occurring materials. Here, using van der Waals epitaxy, we demonstrate the ability to engineer extremely insulating thermal metamaterials based on atomically thin lattice-mismatched BiSe/MoSe superlattices and graphene/PdSe heterostructures with exceptional thermal resistances (70-202 m 2 K/GW) and ultralow cross-plane thermal conductivities (0. 012-0. 07 W/mK) at room temperature, comparable to those of amorphous materials. Experimental data obtained using frequency-domain thermoreflectance and low-frequency Raman spectroscopy, supported by tight-binding phonon calculations, reveal the impact of lattice mismatch, phonon-interface scattering, size effects, temperature, and interface thermal resistance on cross-plane heat dissipation, uncovering different thermal transport regimes and the dominant role of long-wavelength phonons. Our findings provide essential insights into emerging synthesis and thermal characterization methods and valuable guidance for the development of large-area heteroepitaxial van der Waals films of dissimilar materials with tailored thermal transport characteristics.
Grants:	European Commission 885689 European Commission 101029727 Ministerio de Economía y Competitividad SEV-2017-0706
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Phonon transport ; Thermal conductivity ; Frequency-domain thermoreflectance BiSe/MoSe ; Graphene/pdse
Published in:	Nano letters, Vol. 23, Issue 15 (August 2023) , p. 6883-6891, ISSN 1530-6992

DOI: 10.1021/acs.nanolett.3c01280
PMID: 37467035

9 p, 6.1 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles